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Defined 2-way link-list xtext grammar issues [message #1848907]

Thu, 23 December 2021 03:13

Nguyen Duc Dai

Messages: 7
Registered: December 2021

Junior Member

I am working on creating xtext grammar but am facing 1 problem
I have a defined grammar below
I want to create an AST which 's lthe same as a 2-way link-list (Each Step will have 2 feature to refer to next step and previous step), namely:

Step1 ----(nextStep)---> Step2 ---(nextStep)---->Step3
and Step1 <---(preStep)----- Step2 <--(preStep)------ Step3

BUT i dont know how to define grammar to achive that goal

Can someone help me, plz !!!

Usecase:
 firstStep = Step
;

Step:
 name = ID
 ({Step.preStep = current} nextStep = Step)?
;

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Re: Defined 2-way link-list xtext grammar issues [message #1848913 is a reply to message #1848907]

Thu, 23 December 2021 09:31

Christian Dietrich

Messages: 14111
Registered: July 2009

Senior Member

xtext is not good with bidi refs, but you know that you can always use eContainer() to navigate to parent element. i assume it would help here

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Re: Defined 2-way link-list xtext grammar issues [message #1848919 is a reply to message #1848913]

Thu, 23 December 2021 15:25

Nguyen Duc Dai

Messages: 7
Registered: December 2021

Junior Member

Oh my bad ... I forgot this :v ... thank you very much !!!

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Re: Defined 2-way link-list xtext grammar issues [message #1848924 is a reply to message #1848919]

Thu, 23 December 2021 19:15

Ed Willink

Messages: 7379
Registered: July 2009

Senior Member

Hi

In regards to the bidirectional reference, it is easiest to just treat it as unidirectional in the most convenient direction. The magic of EMF will automatically maintain the opposite direction for free.

Regards

Ed Willink

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